Table 3 Radiation Treatment Characteristics
Parameter | N = 31 |
|---|---|
Dose of original RT (Gy) | |
 Median | 60 |
 Range | 18–60 |
Original RT technique | |
 3D conformal | 10 |
 IMRT | 20 |
 Unknown (Plan not available) | 1 |
Original GTV volume (cm3) | |
 Median | 27.9 |
 Range | 5.8–72 |
Original PTV volume (cm3) | |
 Mean | 307 |
 Range | 107–601 |
Interval between original RT and Re-RT (yrs) | |
 Median | 4.28 |
 Range | 0.95–14.5 |
Re-RT dose (Gy) | |
 Median | 30 |
 Range | 15–54 |
Re-RT dose per fraction (Gy) | |
 Median | 2.5 |
 Range | 1.8–15 |
Re-RT technique | |
 3D conformal | 5 |
 IMRT | 23 |
 3D conformal with IMRT boost | 2 |
 SRS | 1 |
Retreat GTV volume (cm3) | |
 Median | 29 |
 Range | 0.3–313 |
Retreat PTV volume (cm3) | |
 Median | 124 |
 Range | 0.5–511 |
Cumulative BED (α/β = 2), (Gy) | N = 25 |
 Median | 96 |
 Range | 72–112 |